To properly size any furnace or ac unit a heat loss calculation should be done(heat gain for ac). Since two houses of the same size, one insulated well and the other not should not have the same size HVAC equipment. Therein lies the problem of sizing by sq ft. Do a search for HVAC Calc for a better idea of what I mean. This can be done by the home owner but is better left to a pro. Either way you will wind up better off and with equipment that suits what you actually need. Thus eliminating paying more for oversized equipment and shortening it`s lifespan by unecessary cycling on & off and also getting the most efficiency for your fuel $`s.
about 12,000
13000
80000
80,000 btus (british thermal units) should heat up 3,500 square feet
Standard practice holds that it takes 5000 BTUs to heat a room 100 to 150 sq ft Figure on adding another 1000 BTUs for every 50 or so sq ft added. Hence , 400 to 450 sq ft would need about 10,000 BTUs
To cool a 3,500 square foot house, you would need a seven ton system. That would be equal to about 84,000 BTUs.
about 12,000
4800 BTUs will 150 square feet.
On average it takes about 1,600 BTUs to heat 50 square feet. Multiplying 50 by 1600 equals about 80,000. Therefore, the heating plan of 1,600 square foot are would take about 80,000 BTUs.
Tonnage is 2 1/2 tons. The 30 indicates the amount of BTUs in hundreds(30hundreds or 3000). 12000 BTUs=1ton, 2400=2tons ,1/2 ton=600 BTUs, thus 12000+12000+6000=30000 or 30hundreds BTUs=2 1/2 tons.
A romm 20x9 is 180 square feet. You will need 5000 to 6000 BTUs for this.
how many square feet will 26,000.00 heat
13000
30000 btus for every 400 square ft
30000 btus for every 400 square ft
80000
its usually about 20 btu's per square foot